错误提示：

java.security.AccessControlException: access denied (java.lang.RuntimePermission accessClassInPackage.org.apache.coyote)

 java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)

 java.security.AccessController.checkPermission(AccessController.java:546)

 java.lang.SecurityManager.checkPermission(SecurityManager.java:532)

 java.lang.SecurityManager.checkPackageAccess(SecurityManager.java:1512)

 sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:298)

 java.lang.ClassLoader.loadClass(ClassLoader.java:296)

 java.lang.ClassLoader.loadClass(ClassLoader.java:296)

 java.lang.ClassLoader.loadClass(ClassLoader.java:248)

 java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)

 org.apache.coyote.http11.InternalOutputBuffer.sendStatus(InternalOutputBuffer.java:452)

 org.apache.coyote.http11.Http11Processor.prepareResponse(Http11Processor.java:1617)

 org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:967)

 org.apache.coyote.Response.action(Response.java:181)

 org.apache.coyote.http11.InternalOutputBuffer.doWrite(InternalOutputBuffer.java:576)

 org.apache.coyote.Response.doWrite(Response.java:560)

 org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:361)

 org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:323)

 org.apache.tomcat.util.buf.IntermediateOutputStream.write(C2BConverter.java:236)

 sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:202)

 sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:272)

 sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:276)

 sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:122)

 java.io.OutputStreamWriter.flush(OutputStreamWriter.java:212)

 org.apache.tomcat.util.buf.WriteConvertor.flush(C2BConverter.java:185)

 org.apache.tomcat.util.buf.C2BConverter.flushBuffer(C2BConverter.java:128)

 org.apache.catalina.connector.OutputBuffer.realWriteChars(OutputBuffer.java:536)

 org.apache.tomcat.util.buf.CharChunk.append(CharChunk.java:256)

 org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:456)

 org.apache.catalina.connector.CoyoteWriter.write(CoyoteWriter.java:143)

 org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:119)

 org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:326)

 org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:342)

 org.apache.jsp.index_jsp._jspService(index_jsp.java:50)

 org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)

 javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

 sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

 java.lang.reflect.Method.invoke(Method.java:597)

 org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)

 java.security.AccessController.doPrivileged(Native Method)

 javax.security.auth.Subject.doAsPrivileged(Subject.java:517)

 org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)

 org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)

头次知道tomcat里面还有policy.d的配置，废了半天时间到处查资料才解决。

修改/etc/tomcat/policy.d/03catalina.policy文件，修改如下：

grant codeBase "file:${catalina.home}/bin/tomcat-juli.jar" {
permission java.security.AllPermission;
};


修改/etc/tomcat/policy.d/04webapps.policy，增加如下两行：

grant {
...........
permission java.lang.RuntimePermission "accessClassInPackage.org.apache.coyote";
permission java.util.PropertyPermission "org.apache.coyote.USE_CUSTOM_STATUS_MSG_IN_HEADER", "read";
..........
};

如果碰到你的servlet有些特殊权限要求，可以在50user.policy文件里面增加：

grant codeBase "file:/var/lib/tomcat5.5/webapps/your_application_path/-" {
permission java.security.AllPermission;
};